Hot-air-furnace attachment



April 22, 1930. E. R. NEVEL 1,755,790

HOT AIR FURNACE ATTACHMENT Filed Dec. 29, 1928 2 Sheets-Sheet l I 7 .1

April 22, 1930. E. R. NEVEL 1,755,790

HOT AIR FURNACE ATTACHMENT Filed Dc. 29, 1928 2 Sheets-Sheet 2 pmwvmInventor Elmer RJI/ve v A itomey Patented Apr. 22, 1930 o ELMER R,NEVEL, or Lo'oK HAvEN, rn'NNsYLvAnIA Hor-AIR F RNAcE ATTACHMENT 'fApplicationfiled December 29, 192s.- Serial No. 329,087.

' Y The present --i nventionrelatestoiimprove I ments'in hot-airfurnacesand has reference ,more particularlytoattachmentslto the'combustionchamber for increasingtheradiating,

surface thereof, g V i c I "Oneof the importantobjects off the presentinvention is .to provide a hot air furnace attachment'thatincludes aformation of copperfins around the exterior ofithe combus- 10 tionchamber of the hot air furnace, 'saidfins being disposed. incloseproximity with respect to each other to; increase lthe efficiency 1 ofthe radiating surface of said combustion chamber.

; Another. important io'bject of the invention resides in the provision,of [a hot air-furnace attachment wherein the;,copper;fins may be castor spot-welded to the )uter'surface of the cast iron combustion chamber,c 1 j-Still a further object resides in sioniof a hot air furnaceattachment that includes a band'thatencircles the major portion of thecombustion chamber, and is fixed 5 1y jsecured 'theretoga series ofradially disposed fins being operatively connected at their inner endswith the band in such a manner as to prevent .casual disengagement ofthe finsfrom the band.

I 1 Another object resides in the provision of I a hot air furnaceattachment of the above mentioned character that will at all times bepositive and efficient in carrying. out, the purposes-forwhich it isdesigned, the same being furthersimple in construction, inex pensive,strong and durable and further well adapted to the purpose for which itis designed- I. 1 Other objects and advantages of the inven; 7' tionwill become apparent from the followi Figure 2 is a fragmentarysectional view the provithrougha portion ofthe combustion chamber I 1 ifins 70f. the hot air furnace, and one of the that jextendsradiallytherefrom.

F igure 3 is a, sectional view takenapproximately on the linedownwardly, o .c I H V I Figure it is an enlarged sectional view throughthe combustion chamber showing the band encircling said chamber 'andbeing j I V securedthereto and illustrating the manner said band.

Figure 5 is a sectional View takenapproiri- I V [mately on the line 5-5of Figure 4.

. Figure 6 is a top plan view-of one of the fins showing the manner inwhich the same is locked at its inner end behind the band that encirclesthe combustion chamber, theband P and saidvc'ombustionchamber beingshown in section.

F1gure 7 ,1s a detail perspective view of one of the radiating finsshowing the tongues before they are bent into locking engagement Y withtheinner face of the'band.=

V Figure 8 is a fragmentary perspective view '7 p p a .of the bandshowing the vertically spaced slots provided therein forreceiving thebendc able tongues of said fins; v v Figure 9'is a view similar toFigure 6 show ing-a modification of thecombustion chamber wherein theouter surface thereof is formedl with an annular channel to accommodatethe band,and V, Figure 10v is a sectional viewftakcn approxi- -mately onthe line l0f1 0 of Figure 9. V In the drawings with reference moreparticularly toF igures "1 to 3 inclusive, the numeral l designatestherast iron combustion chamber of a hot air furnace A, the casingextends around the furnace structure being o "shown at 2. Extendingcircumferenti'al'ly around the combustion chamber'l and beingformedintegrally therewith are the heat radia ting fins?) that are"formed of copper and each of thesefins is preferably of rectangu- 5 larformation, the outer ends of the radially disposed. finsterminating inspaced relation with respectflto. the casing as clearly shown .in Figure1.

The fins 3 are spaced slight distance apart m,

+3 of Fi u 2 QQ -inwhichthe copper. fins extendradially of Y I withrespect to each other so as to increase the radiating surface of thecombustion chamber. These fins may be cast or spot welded to V the outersurface of the cast iron combustion chamber 1.

With reference now to Figures 4 to 8, inclusive,there is illustrateda'copperband 4: that encircles the combustion chamber '1, the ends ofthis split band terminating adjacent the respective sides of the usualopening formed in the front side of the fire box 5 of the hot airfurnace A. The band iis bolted at spaced intervals to, the combustioncham her 1, as shown at 6, and thein'ner face of the band is spaced withrespect to the outer face of the combustion chamber.

' "This copper band isformed at spaced inter vals with a series ofvertically spaced slots 7 V tions of the band as moreclearly disclosedin for receiving the bendable tongues 8 that are formed on the inner endofeaoh rectangular shaped copper heat radiating fin 9, it

being understood of course that the band a is ofa width slightly greaterthan the height of the radiating fins 9 so as to permit thebolts 6 topass through the upper and lower edge pore Figure 5.

p the band and the outer face of the combustion chamber 1 and thisdetail is clearly illus-i trated in Figure 6. 'In this manner the heat lThe free ends of the bendable tongues after being disposed through therespective slots? are bent laterally in opposite directions "forengagement with the inner face of radiating fins 9 will be positivelyanchored in proper position on the outer face of the "circumferentiallyextending band 4:, and the outer end'of the fins terminate in spacedrelation with respect to the circular casing 2.

shown a modification wherein'the outer face i In Figures 9 and 10 of thedrawings there is of the combustion chamber 1 is formed with acircumferentially extending channel lO'toac- 'commodate the copper band4so that the outer face of the copper band will lie substantially flushwith the outer contour of the combustion chamber. Otherwise the band isattached to the combustion chamber in the usual manher as referredtoabove, and the bendable out departing from the spirit of the inventionand the scope of the appended claims.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent is 1. The combination with the combustionchamber of ahot'air furnace, of a band encircling said combustionchamber and being spaced therefrom, said band being formed witha seriesof vertically spaced slots at spaced intervals, a series of verticalradiating fins arranged radially with respect to the spaced intervals, aseries of vertical radiating fins arranged radially with respect to thecombustion chamber, bendable tongues formed in the inner end-of each-finfor disposition through the respective slots in the band, the free endsof the tongues being bent laterally for engagementlwith the inner faceof the band and the outer face of thecombustion "chamber, said bandbeing of a width greater thanrthe height of the fins, and attachingbolts for the band extending through the upper and lower edge portionsof the band andthe' combustion chamber.

In testimonywhereof I affix my signature.

ELMER 11.

tongues 8 when engaged with the channeled is portion 10 and the innerface of the band 4:.

7 It will thus be seen from the foregoing description, that I haveprovided an attachment for hot air furnaces that will increase theradiating surface of the combustion chamber, and my attachment is ofsuch a nature as to permit the same to be installed on the combustionchamber either as an integral part thereof, or as a separate unit, andthis with- V out going to much expense. p

' While I have shown the preferred embodimentof my invention it is to beunderstood that minor changes in the size, shape and ar- 7 rangement ofparts may be resorted to with-

